EPS

EPS DTC Troubleshooting: 23

DTC 23: Engine Speed Signal Circuit

NOTE: If the MIL is on, troubleshoot the fuel and emissions systems first.

1. Start the engine, and check the tachometer.

Is the tachometer working correctly?
YES - Go to step 2.

NO - Go to step 5.


2. Connect a commercially available spring scale to the steering wheel.

3. Pull on the scale to measure when the front wheels start to move. If the system is in good condition, the scale should read no more than 34 N (3.5 kgf, 7.7 lbf).

Is the measurement within the specification?
YES - The system is OK at this time.

NO - Go to step 4.






4. Test-drive the vehicle with the vehicle above 6.2 mph (10 km/h).

Does EPS provide power assist?
YES - Go to step 5.

NO - Do the troubleshooting for DTC 22.


5. Turn the ignition switch to LOCK (0).

6. Disconnect EPS control unit connector B (14P).

7. Start the engine.

8. Measure the voltage between EPS control unit connector B (14P) terminal No. 5 and body ground.

Is there about 3 to 6 V?
YES - Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck.

NO - Go to step 9.






9. Turn the ignition switch to LOCK (0).

10. Short the SCS line with the HDS.

11. Disconnect ECM connector A (32P) ('00-05 models) or ECM connector E (31P) ('06-09 models).

12. Check for continuity between ECM connector A (32P) terminal A19 ('00-05 models) or ECM connector E (31P) terminal E25 ('06-09 models) and EPS control unit connector B (14P) connector terminal No. 5.

Is there continuity?
YES - Go to step 13.

NO - Repair the open in the wire between the EPS control unit and the ECM.


'00-05 models





'06-09 models





13. Disconnect gauge assembly connector C (20P) ('00-03 models) or B (30P) ('04-09 models).

14. Check for continuity between EPS control unit connector B (14P) terminal No. 5 and body ground.

Is there continuity?
YES - Repair the short in the wire between the EPS control unit and the ECM.

NO - Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck.